Silicone gaskets tend to hang on to smells, follow this procedure to clean it and then leave it out in the air until the next use. Generally, you should store your electric pressure cooker with the lid upside-down which would naturally air out the gasket. I know it doesn't look pretty, though!
http://www.hippressurecooking.com/forums/topic/deodorising-a-gasket/
Good luck, and don't worry the smell shouldn't affect the food you cook in it.
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